Use the information below to answer Question 12 and Question 13. People arrive at a checkout in a supermarket randomly, and at a constant mean rate of 0.5 per minute. Assume the arrival times follow a Poisson distribution. Find the probability that exactly 3 people arrive at the checkout during a 5-minute period. A. 0.5438 B. 0.4562 C. 0.2138 D. 0.7576 Question 13 Find the probability that at least 2 people will arrive at the checkout in a 2-minute interval. A. 0.1839 B. 0.2642 C. 0.7358 D. 0.0803

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